Shares of the following companies had unusual moves in Vietnam trading. Stock symbols are in parentheses and prices are as of the close in HCM City.

The VN Index, the benchmark measure of the HCM City Stock Exchange, gained 0.5 percent to 410.57. The gauge fell 2.7 percent this week, the biggest weekly drop since September.

DHG Pharmaceutical Joint-Stock Co. (DHG VN), Vietnam’s biggest publicly traded drugmaker, rose 0.8 percent to 66,000 dong, rebounding from a two-day drop. The company, based in Can Tho, the Mekong Delta’s commercial centre, will pay a 2011 dividend of 1,000 dong a share on December 7, according to an exchange statement.